The Bitcoin believers: Rory tries out an ATM that turns cash into computer code

These are interesting times to hold a Bitcoin conference. The currency has seen wild gyrations, with new investors rushing in, then rapidly finding that prices can go down as well up. Regulators have been taking a closer interest, particularly since another innovative currency scheme, Liberty Reserve, proved to be a haven for criminals and money launderers . And on Tuesday, some of the biggest investors in Bitcoin, the Winklevoss brothers of Facebook fame, have announced plans to float a business based on the virtual currency.